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Canada Thistle Resources

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Colorado Department of Agriculture. Conservation Services Division. Noxious Weed Program.
University of Nebraska - Lincoln. Cooperative Extension.
Ohio State University. Ohio Agricultural Research and Development Center.
USDA. APHIS. Cooperative Agricultural Pest Survey. National Agricultural Pest Information System.
USDA. NRCS. National Plant Data Center.
USDA. ARS. National Genetic Resources Program. GRIN-Global.
Montana Weed Control Association.
Australian Government. Department of the Environment and Energy.